Title:
【発明の名称】ジュールトムソンプローブ用の予備冷却システム
Document Type and Number:
Japanese Patent JP2001502788
Kind Code:
A
Abstract:
A miniature mixed gas refrigeration system and method of operation are disclosed. An optimum gas mixture is formulated from a group of component fluids, according to calculated thermodynamic properties of a group of candidate fluid mixtures. The gas mixture is pressurized by a compressor to a pressure less than 420 psia, for safety reasons. The compressed gas mixture is passed through a primary heat exchanger, and then through a primary-to-secondary heat exchanger, to precool the gas mixture. The secondary side of the primary/secondary heat exchanger is cooled by a secondary Joule-Thomson refrigeration system. Properly sized flow restrictions in the primary side of the primary/secondary heat exchanger can solidify and trap liquid contaminants that may be in the gas mixture. The gas mixture exiting the primary outlet of the primary/secondary heat exchanger passes to a primary Joule-Thomson expansion element where the high pressure gas is expanded isenthalpically to a lower temperature at least as low as 183K. This low temperature gas cools a heat transfer element mounted in the outer wall of the catheter, to cool an external object. Return gas flows back through the primary heat exchanger to further pre-cool the incoming high pressure gas mixture. A distal primary heat exchanger can be added between the primary/secondary heat exchanger and the primary Joule-Thomson expansion element.
Inventors:
Dobak John The Third
Brown terry ell
Gael the Day Cambis
Yu Xiaoyu
Brown terry ell
Gael the Day Cambis
Yu Xiaoyu
Application Number:
JP51940998A
Publication Date:
February 27, 2001
Filing Date:
October 07, 1997
Export Citation:
Assignee:
Cryogen Incorporated
International Classes:
A61B18/02; C09K5/04; F25D3/10; F25B9/00; F25B9/02; F25B7/00; (IPC1-7): F25B9/02; A61B18/02; F25D3/10
Attorney, Agent or Firm:
Minoru Nakamura (6 outside)